Using Mini mPOS

Prepare products, tax and staff access

Before you take real payments, complete the Adyen connection setup. You need a payment terminal or the Adyen Payments app. Then prepare your products, tax and staff access once.

Set the currency and tax

1. In Settings › Payments, choose a Currency that your merchant account accepts for in-person payments.
2. In Settings › Tax, check the rates, whether prices include tax or tax is added at checkout, and the default rate for new products.

Every product has a tax rate; use a 0% rate for untaxed items. Switching off Charge tax stops charging tax but keeps the rates.

Add products

1. Open Products and tap +.
2. Enter a name, price and tax rate. Optionally add a category and a barcode, typed or scanned.
3. For a deposit, switch on Pre-authorization product so that it appears only in pre-authorizations.

Set staff PINs

1. In Settings › Security, tap Set admin PIN. It protects Settings and Products. Choose how soon the app locks again.
2. Optionally, tap Set Manager PIN. Staff then need it for refunds, cancellations, captures, amount adjustments and entering tips.

To replace or remove the admin PIN, use Change Admin PIN or Remove Admin PIN; removing it also removes the Manager PIN. Repeated wrong attempts lock PIN entry for a while. For a forgotten PIN, see PIN problems.

Back to contents

Take a card payment

1. On Home, tap New sale. Tap products, tap Scan barcode, or add a Custom item.
2. Tap Charge. Check the items, tax and total, and fill in any reference or email fields.
3. Tap Pay. The terminal, or the Adyen Payments app with Tap to Pay, asks the customer to pay.
4. Wait for the result. Do not start another payment until it appears.
5. Give the customer a receipt with Print receipt, Email receipt or Share receipt, unless it was delivered automatically.

Customer references, card saving and tips are optional; see references and saved cards. To let customers pay on their own phone, use a payment link. If a payment is declined, see declined payments.

Back to contents

Scan a shopper wallet code

Use Scan wallet at sale checkout to read a payment code from the shopper’s wallet app. This is different from scanning a product barcode or a refund receipt. It works with a physical payment terminal, not Tap to Pay; wallet discovery needs a read role.

1. Check the total and checkout fields, then tap Scan wallet. If receipt tipping is selected, confirm paying without it: the wallet charges the total immediately, not a pre-authorization.
2. Choose the shopper’s wallet. A single available wallet is selected automatically. Only individually configured wallets appear; Alipay+ does not imply separate GCash, DANA, Kakao Pay or TrueMoney choices.
3. On a confirmed scanner-equipped terminal, press its scan button. This may be the network/cloud terminal, not the device running Mini mPOS. To scan with the device’s camera instead, tap Use camera.
4. Scan the shopper’s payment QR code or payment barcode. One valid scan starts payment immediately. Wait for the normal payment result and deliver its receipt.

Canceling keeps the cart and checkout fields. Invalid codes do not pay: scan again or change wallet. A native scan expires after 30 seconds; use Scan again or the camera. Leaving the app stops scanning; returning requires an explicit new scan. Codes cannot be typed or pasted.

Save card requests best-effort saving when shopper reference and consent allow it. Wallet support varies; only a returned stored-payment token means details were saved. An approved payment without a token is still approved. Handle wallet discovery or payment problems; never replace an unknown payment by scanning again.

Confirm your wallet setup and test behavior with the Adyen wallet guide and Adyen PayPal and Venmo guide.

English simulator demos of wallet scanning.

Back to contents

Refund or cancel a payment

Refund

For a charged payment. Returns all or part of the money.

Cancel (void)

For a held payment that has not been captured: tap Cancel pre-authorization for a deposit, or Cancel payment for a sale Awaiting tip. This releases the hold.

To refund:

1. On Home, tap Refund and scan the refund QR code on the receipt, or open the original sale in History.
2. Choose a full refund, an amount or individual items. Item refunds need the original sale on this device.
3. Confirm the refund, and enter the Manager PIN if asked.

Every refund is linked to its original payment; refunds without one are not supported. Refund paid payment links in the Customer Area.

Back to contents

Print, email or share receipts

From a payment result or a History entry, tap Print receipt or Email receipt. Tablets and phones also offer Share receipt, which sends an image through Android's share menu. Printing needs a terminal with a printer.

Customize and test receipts

1. In Settings › Receipts, enter your business details, header and footer. Or tap Import business details from Adyen to fill blank fields from your Adyen store.
2. Choose Print automatically after payment, when to print a Merchant copy, and whether to Show refund QR code.
3. Tap Print test receipt and check the printout. The on-screen preview does not show the printer's exact layout.

Other options:

Show tax amounts

Shows the tax included in, or added to, the total. It does not change the tax charged.

Show tax breakdown

Lists the tax for each rate. Needed to show included tax when prices include tax.

Show taxable totals by rate

Groups item totals by tax rate, including 0%.

Show references

On by default. Prints the merchant reference and any customer reference, so that a receipt can be matched to its payment.

Marked tax rate (%)

Marks items at that rate with an Item marker and its explanation. Leave it blank for no marker.

Characters per line

32 by default, for narrow receipt rolls. Choose the width for your printer with a test print.

Set the language

The app supports English, Simplified Chinese and Japanese. On Android 12 or earlier it follows the device language; on Android 13 or later, choose it in Android's per-app language settings. Adyen's card receipt lines follow the terminal's own receipt language.

Set up email receipts

1. Open Settings › Email (SMTP). Choose your provider, or enter the SMTP server, port, sender and login. Use STARTTLS or SSL/TLS.
2. Send a test email.
3. In Settings › Payments › Email receipts, choose when to ask for the customer's email and whether to send receipts automatically.

Follow your provider's instructions to allow SMTP and get the right password:

• Gmail
• Microsoft 365
• iCloud Mail
• Yahoo Mail
• Fastmail
• Zoho Mail
• Proton Mail

If receipts do not print or send, see printer and email problems.

Back to contents

Find payments and close the day

History lists payments and refunds by day, with daily totals.

• Filter by sales, Awaiting tip, pre-authorizations, refunds or Needs attention, and use Payment method for a card brand or wallet.
• Search by reference, authorization code, customer reference or email, the card's last four digits, brand, wallet or exact amount. Every word must match: visa 34 finds Visa payments of 34.

On-screen totals follow your search and filters. Held payments, such as deposits and tips on the receipt, count as sales on the day their capture is accepted.

Close the day

1. Open History, filter by Needs attention and resolve each entry; see unknown results.
2. Check the Awaiting tip and pre-authorization filters. Enter tips, and capture or cancel deposits before their holds expire.
3. Tap the print icon beside the day to print the Local daily summary.
4. Reconcile with Adyen's reports in the Customer Area; see the Adyen settlement reconciliation guide.

The summary covers the whole day, ignoring filters: sales, tips included, accepted refunds, net, new holds and unresolved operations, for each currency. TEST and simulator activity is labeled. Paid payment links and captures without a known date are listed separately as undated activity.

Back to contents

Use references and save cards

Merchant reference

To record a booking or order number, turn on Settings › Payments › Ask for a merchant reference. The number identifies the payment in Adyen. If left blank, a unique reference is generated.

Shopper reference

In Settings › Payments, choose the Shopper reference: a customer reference typed at checkout (the default), the customer's email, or none. It is sent to Adyen with every payment. Email references are hashed by default; use the same salt on every device.

Saved cards

With a shopper reference set, turn on Offer to save cards and choose the Recurring processing model for your Adyen setup. Get the customer's consent before selecting Save card for future payments. Mini mPOS cannot charge saved cards.

Back to contents

Take payment with a link

1. At a sale's checkout, tap Create payment link.
2. Show the QR code, or tap Email link, Print link or, on a tablet or phone, Share link.
3. Keep the link screen open to see the payment arrive, or later tap Check payment in its History entry.
4. If the link is no longer needed, tap Cancel link.

The entry shows Awaiting payment until the link is paid, expires or is canceled. Set how long links work in Settings › Payments › Payment links. Links are for sales only, not deposits or tips on the receipt.

If a link is missing or not updating, see payment link problems.

Back to contents

Hold and collect a deposit

A pre-authorization holds an amount on the card without charging it. Your whole account does not need manual capture; Mini mPOS requests it for these payments only.

1. On Home, tap New pre-authorization. Choose a pre-authorization product, scan its barcode or enter an amount. Each pre-authorization has one item.
2. At checkout, tap Pre-authorize. The receipt shows the amount held.
3. When you are ready, open the entry in History and choose an action:

Capture

Collects the amount owed. A lower amount releases the rest; a higher amount first asks the card issuer to increase the hold. Refunds are possible once capture is requested.

Adjust amount

Changes the amount held without charging it. Submitting the same amount renews the authorization.

Cancel pre-authorization

Releases the hold. If the payment was already captured in the Customer Area, Adyen refunds it in full instead.

Capture requested is not final confirmation; check the Customer Area. For immediate answers to adjustments, enable Return adjust authorisation data as described in the Adyen authorization adjustment guide.

Back to contents

Collect a tip written on the receipt

In Settings › Payments › Tipping, choose Enabled (default off) or Enabled (default on) to set how the checkout switch starts. Disabled, the default, hides it. Some debit cards and wallets do not support this flow.

1. At a sale's checkout, switch on Tip on the receipt and tap Pay. The bill is held, not charged.
2. Print the receipt. It has blank Tip and Total lines, and the merchant copy has a signature line.
3. When the customer has filled it in, tap Enter tip on the result or in History's Awaiting tip filter.
4. Enter the tip or the total, or tap No tip, and confirm.

The app captures the bill plus the tip. Tips over 20% first need the card issuer to increase the hold; if it refuses, enter a smaller tip or none. A saved tip cannot be changed. Before a tip is entered, cancel the payment instead of refunding it; afterward, refunds include the tip.

Back to contents

Set up more devices and manage data

1. On the configured device, open Settings › Data › Share with another device. Choose the catalog, settings and/or passwords and keys, then tap Show QR codes.
2. On the new device, choose Set up from another device and scan all the codes, in any order. Choose whether to merge or replace its catalog.
3. To copy passwords and keys, enter the transfer code shown on the first device. Tap Import.
4. Check prices and tax, test the connection in Settings › Terminal, and print a test receipt.

The new device keeps its own payment destination, terminal, environment and Tap to Pay registration. A shared key works for another terminal only if Adyen assigns it the same key.

In Settings › Data, set Keep transactions for or tap Clear settled history; unresolved payments are always kept. Install updates from the latest release in the same way as the original installation.

For import problems, see PIN and transfer problems.

Back to contents